Vintage Blue Masthead

Welcome to Vintage Blue!

This site is loosely dedicated to the legendary invention of Jess Oliver, the famous AmpegTM B15N Portaflex bass amplifier, as well as Portaflex's in general.  I am not, by any stretch of the imagination, a tube amp technician.  Therefore, this site is geared more toward the actual cabinets, particularly Jess’s original double-baffle design.


B15 Patent Drawing

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